Posted by Lily on .
A rancher wants to build a rectangular pen with an area of 150 m2. Let W be the width of the pen and L be the length of the pen.
a. Find an equation for the perimeter P in terms of W and L .
b. Use the given area to write an equation that relates W and L .
c. Find the pen dimensions that require the minimum amount of fencing.
Width =
Length =

Calculus 
Jack,
P = 2L + 2W
150 = LW
150/L = W
P = 2L + 300/L
Can you finish from here?